Lewis Short
(verb) : vĭrĭdo, āre, 1, and n. id..
* Act., to make green, cause to grow green: hastas floribus,Val. Fl. 6, 136: vada subnatis viridentur ab herbis,become green,Ov. Hal. 90.—More freq.
* Neutr., in the part. pres. viridans, growing green, green, verdant: cingit viridanti tempora lauro,Verg. A. 5, 539: herbae,Lucr. 2, 33; 5, 1396: hedera,Plin. 8, 32, 50, § 117; cf.: proximus ut viridante toro consederat herbae,Verg. A. 5, 388: gemmae,Plin. 37, 8, 34, § 113: color,Lucr. 5, 785.
Charlton T. Lewis, Charles Short, A Latin Dictionary